New cooker fitted,electrical problem or faulty product?

[cjb1971]

Just installed a new built in cooker,after a few minutes the flames start to lift and it cuts out,with door slightly open it works fine so obviously not getting enough air.The fan on the back seems to be sucking air in rather than blowing it out,not worked on many ovens,should it draw air in or blow it out?The electrics had allready been sorted befor i got there,would reverse polarity cause the fan to rotate the wrong direction therefore causing such a problem?Or is it likely to some kind of blockage internally??

 

[giblets]

Have you checked the MI to see what the correct ventilation should be to the oven housing? As far as I am aware AC fans cannot run backwards even with reversed L & N.

 

[cjb1971]

Yeah the housing seems fine,i even rmoved it from housing and tested it sat on the kitchen floor still the same problem,just hada quick look at my own oven and the fan on the back of it seems to blow rather than suck,advised them to ring the manufacturers in the morning.

 

[namsag]

Is it a stoves .had exactly same prob and everything was spot on . Manufacturers came out soi sorry don`t know the out come

 

[JohnD]

AC supply cannot have reverse polarity. You've been watching too much Doctor Who.

Oven fans generally suck air in at the middle and blow it out round the rim. So if the fan is in the middle of the back of the oven it will suck air out of the oven, and blow it (over the heating element) so that it comes out of the vents in the oven false back.

 

[cjb1971]

The oven was a new world nw60g.

 

[Hugh Jaleak]

I have come across a couple of New World ovens. The fan you describe may be designed to suck air IN, it circulates air around the outer casing to cool the sides and stop the housing cupboard from scorching. If its new get manufacturers to have a look under warranty.

 

[securespark]

AC supply cannot have reverse polarity.

Methinks what the honarable JD meant to say was that reverse polarity on AC circuits does not reverse the direction of rotation.

 

[JohnD]

well, I really meant that if P has a positive on it, in 1/100th of a second it will be negative, then another 1/100th of a second later it will be positive again. And N will be changing from Neg to Pos and back again at the same rate.

You know the old saying, "reverse the polarity of the neutron flow". doesn't make sense on an AC supply.

By polarity I meant Pos and Neg not Phase and Neutral

And yes, it will make no difference to an ordinary AC motor which terminal you connect P and N to, it will always spin forward